CN1540635A - Information recorder and information recording methods - Google Patents
Information recorder and information recording methods Download PDFInfo
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- CN1540635A CN1540635A CNA2004100369421A CN200410036942A CN1540635A CN 1540635 A CN1540635 A CN 1540635A CN A2004100369421 A CNA2004100369421 A CN A2004100369421A CN 200410036942 A CN200410036942 A CN 200410036942A CN 1540635 A CN1540635 A CN 1540635A
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0045—Recording
- G11B7/00456—Recording strategies, e.g. pulse sequences
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/006—Overwriting
- G11B7/0062—Overwriting strategies, e.g. recording pulse sequences with erasing level used for phase-change media
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- Optical Recording Or Reproduction (AREA)
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Abstract
An information recording apparatus (1) irradiates a recording light, such as a laser light, on a recording medium (D), such as various kinds of optical discs, and records information. A recording pulse signal (S10) is generated based on a recording signal (Sr) corresponding to the information to be recorded. The recording pulse signal is also called 'strategy signal', and the signal includes driving pulses which drive a light source for forming a recording mark on the recording medium. As to the recording light such as the laser light, the high frequency signal (S12) is superimposed for decreasing occurrence of noise due to mode hopping. The high frequency signal (S11) is generated as a digital signal, and the signal is added to the recording pulse signal to generate a driving pulse signal (ILD). Then, the light source is driven and the recording light is emitted. By generating the high frequency signal as the digital signal, it is possible to control a frequency and a phase thereof with high accuracy.
Description
Technical field
The present invention relates to the information recording technique on a kind of CD.
Background technology
But the record of the information on the record type CD that in addition also is recordable and can writes again be by by corresponding to the pulse signal driving laser source of record data, produce recording laser and it be radiated on the information recording surface of CD and carry out.As lasing light emitter, utilized the semiconductor laser such as laser diode.The power of recording laser is to be controlled by the magnitude of current that the driving circuit such as laser driver offers laser diode by control.Laser driver switches a plurality of current sources, and the driving laser diode, and the magnitude of current of wherein said a plurality of current sources is to preset according to the drive pulse signal corresponding to information to be recorded.Described drive pulse signal is controlled the laser from the laser diode emissive power, and forms the recording pit (record mark) corresponding to data to be recorded on CD.
Therefore, the noise of semiconductor laser characteristic has influenced recording quality to a great extent.For example, from the part of the output light of semiconductor laser owing to be returned to semiconductor laser from the reflected light and the other reasons of recording medium, jump, i.e. so-called " mode hopping " in the vertical pattern take place, and laser output changes.Thereby, noise has taken place.This noise problem aspect semiconductor laser is big especially.As the method for the noise that reduces this semiconductor laser, known so-called high-frequency signal stacking method, wherein on recording the information in CD in, high-frequency signal of stack on recording pulse signal.
When adopting the high-frequency signal stacking method, two kinds of methods have been advised, promptly, a kind of be Jap.P. openly apply for disclosed in 2000-149302 number, change the frequency of overlapped high-frequency signal and the method for amplitude according to the operator scheme of optical disk recording device, a kind of is openly to apply for stack time method disclosed in 2002-230813 number, the control high-frequency signal at Jap.P..
Recently, existence is for the strong request of high-speed record.In order to realize high-speed record, the recording pulse signal trend becomes at a high speed, and just, the frequency of recording pulse signal trends towards higher.Thereby, there is a problem, promptly Die Jia high-frequency signal and recording pulse signal become closer to each other, and disturb between them.Particularly, at the rising and the sloping portion of recording pulse signal, high-frequency signal becomes big to the influence of recording pulse signal, and may reduce recording quality.
As illustrated in above-mentioned Japanese patent application, in traditional high-frequency signal stacking method, because high-frequency signal is by the mimic channel generation, so high-frequency signal and recording pulse signal do not have correlativity.Therefore, be difficult to, the stack amount of frequency and high-frequency signal is carried out Optimal Control according to the laser power during the recorded information, for example Writing power, erase power and substrate bias power.In addition, because high-frequency signal is asynchronous with recording pulse signal, so the phase relation between high-frequency signal and the recording pulse signal can not Be Controlled.Therefore, the drive pulse signal that is used to drive semiconductor laser is owing to the influence of high-frequency signal becomes unstable, and may reduce the recording of information quality.
Summary of the invention
In order to address the above problem, realized the present invention.One of purpose of the present invention is to reduce in the influence to recording pulse signal of the information-recording apparatus that adopts the high-frequency signal stacking method and the middle and high frequency signal of information recording method, and stops the decline of recording quality whereby.
According to one aspect of the present invention, a kind of information-recording apparatus is provided, comprise: light source, its emission is used for the record light of information record, the recording impulse generation part, it produces the recording pulse signal corresponding to the tracer signal of input, the high-frequency signal production part, it produces digital high-frequency signal based on tracer signal, totalizer, and it is with recording pulse signal and high-frequency signal addition, so that generation drive pulse signal, and driver part, it is based on the drive pulse signal driving light source, so that emission record light.
Above-mentioned information-recording apparatus is the record light of emission such as laser on such as the recording medium of various CDs, and recorded information thereon.When being transfused to, based on the tracer signal generation recording pulse signal of described input corresponding to recording of information signal to be recorded.Recording pulse signal is also called " mode signal ", and comprises and be used for driving light source so that form the driving pulse of record mark on recording medium.
Be the record light overlapped high-frequency signal such as laser, so that reduce generation by the caused noise of mode hopping or the like.In the present invention, high-frequency signal produces as digital signal, and is added on the described recording pulse signal so that produce drive pulse signal.By described drive pulse signal, the light source such as laser diode is driven, and record light is launched.By high-frequency signal is produced as digital signal, become and to come controlled frequency and phase place thereof with high precision.Therefore, by produce suitable high-frequency signal based on tracer signal, can suppress the harmful effect that the stack by high-frequency signal causes, and can improve recording characteristic.
Preferably, the rising part of each pulse that above-mentioned high-frequency signal can comprise in described recording pulse signal and falling portion office have constant phase relation with recording pulse signal.Whereby, because shape that can the fixed drive signal, so, also can carry out stable information record even in the time of the overlapped high-frequency signal.In a concrete grammar, the high-frequency signal frequency in each recurrence interval is determined to be in the rising part and the falling portion office of each pulse that comprises in the described recording pulse signal, has constant phase relation with described recording pulse signal.The state that " has constant phase relation " can be that the rising part of each pulse of comprising in described recording pulse signal of the phase place of described high-frequency signal is consistent with the phase place of recording pulse signal with the falling portion office, and can be that the phase place of high-frequency signal is before the phase place of described recording pulse signal or constant angle afterwards.
Further, the high-frequency signal production part recording power level that the amplitude of high-frequency signal can be defined as for each recurrence interval in each recurrence interval that comprises in the recording pulse signal is best.Specifically, has different amplitudes in each cycle in high-frequency signal each pulse that can in described recording pulse signal, comprise.
The high-frequency signal production part can comprise: storage comprises the high-frequency signal table corresponding to the high-frequency signal data of the preset frequency of record mark length and amplitude, with reference to described high-frequency signal table, obtain corresponding to the high-frequency signal frequency of each record mark and the parts of amplitude based on the record mark length that comprises in the tracer signal of input, and the parts that produce the digital high-frequency signal with the frequency that is acquired and amplitude.Whereby, based on the record mark in the tracer signal, determine frequency and amplitude by the pre-prepd high-frequency signal table of reference, and produce digital high-frequency signal.Described high-frequency signal table can define not only corresponding to record mark length but also corresponding to the high-frequency signal data of the spacing before the record mark length.Whereby, can produce suitable high-frequency signal by the influence of considering waste heat or the like.
In addition, recording pulse signal can be produced as simulating signal, and can resemble and recording pulse signal is produced as digital signal the high-frequency signal.When recording pulse signal is produced as digital signal, can change and obtain drive pulse signal by after high-frequency signal and described digital recording signal plus, this signal being carried out D/A.Alternatively, can be by after carrying out D/A conversion respectively, recording pulse signal be obtained drive pulse signal in the Calais with high-frequency signal mutually as simulating signal.
When understanding in conjunction with the accompanying drawing of following concise and to the point description, speciality of the present invention, practicality and further feature will be according to the detailed description of following most preferred embodiment with respect to invention and clearer.
Description of drawings
Figure 1A and 1B are the wave recording examples when execution information writes down on CD by information-recording apparatus.
Fig. 2 is the chart that illustrates according to the schematic structure of the record cell of this embodiment.
Fig. 3 is the chart that illustrates according to the schematic structure of the information of embodiments of the invention record and reproducing device.
Fig. 4 is the chart of structure that first embodiment of the record controls parts shown in Fig. 3 is shown.
Fig. 5 illustrates an example of high-frequency signal table.
Fig. 6 illustrates an example of the structure that produces the high-frequency signal table.
Fig. 7 is the process flow diagram of the generation flow process of high-frequency signal table.
Fig. 8 A and 8B are the charts that the mode data of utilizing when producing the high-frequency signal table are described.
Fig. 9 is the chart of structure that second embodiment of the record controls parts shown in Fig. 3 is shown.
Figure 10 illustrates an example of the table of Waveform Control shown in Fig. 9.
Figure 11 A illustrates the example that is stored in the numerical data in the Waveform Control table to 11C.
Embodiment
Now will be hereinafter with reference to description of drawings most preferred embodiment of the present invention.
[principle]
Figure 1A and 1B illustrate the example of the wave recording when execution information writes down on CD by information-recording apparatus.It should be noted that example is for DVD-RW, this is a CD example.Because Figure 1A and 1B are the relations between the schematically illustrated signal waveform, so the frequency of each signal is different from its actual frequency.
Figure 1A is the example in the high-frequency signal stacking method, on the recording pulse signal that will be added to by the high-frequency signal that mimic channel produces (mode signal).In Figure 1A, recording pulse signal is corresponding to tracer signal, and this signal comprises three power levels, that is, and and th writing power P w, erase power Pe and substrate bias power Pb.In above-mentioned high-frequency signal stacking method, high-frequency signal is superimposed on the recording pulse signal.This high-frequency signal produces by mimic channel.Current waveform by signal that recording pulse signal and high-frequency signal addition are obtained is represented as the LD drive current.Semiconductor laser such as laser diode is driven by the LD drive current waveform, and produces the record light that will be irradiated onto on the CD.
Because high-frequency signal is to produce by the mimic channel in the example in Figure 1A, so be difficult to carry out adaptive control to high-frequency signal frequency and stack amount.In addition, because high-frequency signal and mode signal differ from one another the step, so the waveform of the rising part of LD drive current and sloping portion is different at each part place.For example, at rising part 71 and 72 places for Writing power, the waveform of LD drive current is different.In addition, in the sloping portion from Writing power to substrate bias power 73 and 74, the waveform of LD drive current is different.Because recording pulse signal and high-frequency signal differ from one another the step, so the waveform of the rising of LD drive current/falling portion office is subjected to the influence of high-frequency signal phase place aspect timing, even and in same LD drive current waveform, the waveform of a plurality of riser portions office also is inequality.The situation of sloping portion also is the same.Thereby, also inconsistent each other corresponding to same tracer signal LD drive current waveform, and the shape of formed record mark becomes unstable.
Figure 1B illustrates the example according to the wave recording in the information-recording apparatus of the present invention.In the present invention, the high-frequency signal that is added produces as digital signal.Therefore, frequency, amplitude and the phase place that becomes and be easy to control high-frequency signal.In addition, can also be by producing high-frequency signal based on tracer signal, make the phase place of recording pulse signal and high-frequency signal in the rising/sloping portion of recording pulse signal consistent each other (synchronization).By with recording pulse signal and high-frequency signal synchronization, the waveform shape in the rising/falling portion office of LD drive current can almost be constant.For example, in Figure 1B, the shape of LD drive current waveform the rising part 81 of LD drive current with 82 and sloping portion 83 almost be identical with 84 places.Whereby, can be always identical tracer signal and form identical record mark, and can improve recording characteristic.
Fig. 2 illustrates the schematic structure according to the record cell of these embodiments of the invention.Record cell 10a uses as record cell in the information-recording apparatus of CD.Record cell 10a by the drive pulse signal driving laser diode that produces based on tracer signal, launches recording laser from outside receiving record signal.
As shown in Figure 2, record cell 10a comprises recording pulse signal production part 12, high-frequency data production part 16, digital-to-analog converter 18, totalizer 14 and serve as the laser diode (after this, it also is known as " LD ") 15 of light source.
Recording pulse signal production part 12 is based on the tracer signal Sr output record pulse signal S10 that provides as the NRZI signal usually.On the other hand, high-frequency data production part 16 produces the high-frequency data S11 that will be superimposed on S10 on the recording pulse signal based on tracer signal Sr.Here, 16 generations of high-frequency data production part are as the high-frequency data of digital signal.That is to say that high-frequency data production part 16 uses the clock based on tracer signal Sr, and produce and serve as the high-frequency data S11 of digital signal, so that provide data to digital-to-analog converter 18.Digital-to-analog converter 18 will be converted to simulating signal as the high-frequency data S11 of digital signal, and this signal is offered totalizer 14 as high-frequency signal S12.It should be noted, the high-frequency signal of digital signal and simulating signal after by being respectively referred to as " high-frequency data " and " high-frequency signal " distinguished.
Totalizer 14 will be from the recording pulse signal S10 of record pulse signal generating means 12 with from the high-frequency signal S12 addition of digital-to-analog converter 18, and produces LD drive current I
LDDrive LD15.
High-frequency data production part 16 produces high-frequency data S11 based on tracer signal Sr, so as with the recording pulse signal S10 of rising/falling portion office of recording pulse signal S10 on phase place synchronously.Specifically, can determine the frequency of high-frequency data S11, thus this high-frequency signal with the recording pulse signal of rising/falling portion office of recording pulse signal S10 on phase place synchronously.Further, high-frequency data production part 16 can also change the level (amplitude) of high-frequency data S11 according to the level (that is, Writing power level, erasing power level, and substrate bias power level) of recording pulse signal S10.
Like this, in the present invention, because the high-frequency signal that is superimposed on the recording pulse signal produces as digital signal, so that this signal and recording pulse signal are synchronous at the rising/sloping portion of recording pulse signal, so identical tracer signal is to write down by identical LD drive waveforms all the time.Therefore, can improve recording characteristic, remove the harmful effect of high-frequency signal simultaneously.
[information record and reproducing device]
Fig. 3 is schematically illustrated according to the information record of embodiments of the invention and the one-piece construction of reproducing device.Information record and reproducing device 1 recorded information on CD D, and reset from the information of CD D.For example, CD D can be CD-R (recordable CD) and the DVD-R (recordable digital versatile dish) that only writes down once, and allows to repeat to wipe CD-RW (CD that can write again) and DVD-RW (the digital versatile dish of repeatable recording) with recorded information.
Information record and reproducing device 1 are included in the optical head 2 that CD D goes up irradiation writing light beam and playback light beam, the spindle motor 3 of the rotation of control CD D, be controlled at the upward record controls parts 10 of recorded information of CD D, the playback control module 20 that control is reset to the information that is recorded on the CD D, and carry out various servo-controlled servocontrol parts 30, described various servocontrol comprises the main axle servo of the rotation of controlling spindle motor 3, and focus servo and tracking servo, these the two kinds servo relative position controls that all are optical head 2 with respect to CD D.
Record controls parts 10 are by hereinafter coming the process of explanation the receiving record data and for the laser diode that drives optical head 2 inside produces drive signal SD, and this signal SD is offered optical head 2.
Playback control module 20 receive by optical head 2 outputs read RF signal S rf, and predetermined demodulating process and decode procedure produce and the output replay data by signal Srf is carried out.
Servocontrol parts 30 receive the RF signal S rf that reads from optical head 2, and provide servosignal 31 such as tracking error signal and focus signal based on this direction of signal optical head 2, and provide main axle servo signal 32 to spindle motor 3.Therefore, various servo process are performed, such as tracking servo, and focus servo and main axle servo.
In the present invention, various known methods can be used to this playback control and servocontrol.Therefore, do not make detailed description here to them.
[first embodiment of record control unit]
Fig. 4 illustrates the structure of first embodiment of record controls parts 10.Record controls parts 10b according to first embodiment comprises mode table 110, mode signal generator part 120, voltage current adapter 130, totalizer 140, high-frequency data production part 160, high-frequency signal table 170 and digital-to-analog converter 180.Mode table 110, mode signal generator part 120 and voltage current adapter 130 are the parts that are used to produce recording pulse signal.High-frequency signal table 170, high-frequency data production part 160 and digital-to-analog converter 180 are the parts that are used to produce high-frequency signal.
Mode signal generator part 120 produces based on tracer signal Sr and is used for the mode signal that writes down according to tracer signal." mode " expression is used for the waveform based on the recording pulse signal of tracer signal driving laser diode 150.For example, mode can be the multiple-pulse type mode that is made of high impulse and a plurality of multiple-pulse, it perhaps can be a non-polymorphic type mode, for example one has high impulse and the mode than this more low level cycle of high impulse after this, and one has high impulse, final pulse and the mode in the intermediate level cycle between described high impulse and described final pulse.It should be noted, can utilize the mode of arbitrary type in the present invention.
Mode table 110 has been stored the information relevant with pre-prepd mode.Specifically, for each dish, record data and be stored in the mode table 110 corresponding to the information of the recording impulse waveform of these record data.For example, when a certain record data will be recorded on a certain dish, the details of stored record pulse waveform, the mode of for example having utilized what type (promptly, above-mentioned multiple-pulse type or non-multiple-pulse type), under the situation of multiple-pulse type, used any value for each high-pulse widths, multiple-pulse width, multiple-pulse number, Writing power level, substrate bias power level or the like.Therefore, mode signal generator part 120 is by based on the tracer signal of input, with reference to the information of mode table 110 obtain manner signal (recording pulse signal), and the producing method signal, so that this signal is offered voltage current adapter 130.Voltage current adapter 130 will offer totalizer 140 corresponding to the electric current of this amplitude based on the mode signal.
On the other hand, high-frequency signal table 170 has been stored to the frequency of best high-frequency signal and the regulation of amplitude, as high-frequency signal information for each record data.It should be noted that high-frequency signal information is predetermined, and be stored in the high-frequency signal table 170.Fig. 5 illustrates an example of the high-frequency signal information that is stored in the high-frequency signal table 170.In the example of Fig. 5, determine the regulation of this high-frequency signal according to the spacing (it is known as " preceding spacing ") before record mark length and the record mark.For example, when the record mark length that is provided by tracer signal and preceding spacing all were 3T, the regulation of high-frequency signal was given as D33.When the mode signal has the multiple-pulse type, the regulation D33 of high-frequency signal can be specified to frequency and the amplitude into each part definition high-frequency signal of mode signal, for example, the frequency in the preceding cycle of high impulse is f1, and its amplitude is M1, and the frequency in high impulse cycle is f2, and its amplitude is M2, and the frequency in multiple-pulse cycle is f3, and its amplitude is M3, or the like.
In the example shown in Fig. 5,, also can adopt another kind of sorting technique although record mark length and preceding spacing are divided into three group 3T, 4T respectively and are equal to, or greater than 5T.Simultaneously, preceding spacing and record mark length can be divided into the group of different numbers respectively, and for example, preceding spacing is divided into three groups, and record mark length is divided into five groups.In addition, in the CD of some kind, the regulation of high-frequency signal can only depend on record mark length and set, and no matter preceding spacing how.In addition, can consider record mark spacing afterwards.
Turn back to Fig. 4, high-frequency data production part 160 with reference to high-frequency signal table 170, and produces high-frequency data as digital signal based on tracer signal, so that give digital-to-analog converter 180 with this data transmission.In the example in Fig. 4, digital-to-analog converter 180 is electric current output types, and will be converted to analog high frequency by the digital high-frequency data that high-frequency data production part 160 produces, and provides corresponding electric current to totalizer 140 whereby.
Totalizer 140 drives LD150 by the electric current corresponding to the summation of the electric current of the high-frequency signal that provides with the corresponding electric current of the recording pulse signal that is provided by voltage current adapter 130 and by digital-to-analog converter 180.Whereby, LD150 is driven by the drive pulse signal that has been applied high-frequency signal, and forms the record mark corresponding to tracer signal on CD D.
[being used to produce the process of high-frequency signal table]
Next, explanation is used to produce the process of high-frequency signal table.Fig. 6 illustrates the structure that is used to produce the high-frequency signal table.As shown in Figure 6, by carrying out the program of a preparation, CPU190 is with reference to mode table 110, and produces high-frequency signal information based on these mode data, so that this information is deposited in the high-frequency signal table 170.Whereby, produced the high-frequency signal table.
Fig. 7 is the example of process flow diagram that is used to produce the process of high-frequency signal table.It should be noted that in this example, as shown in Figure 5, record mark length and preceding spacing are divided into three group 3T, 4T respectively and are equal to, or greater than 5T.In addition, as shown in Figure 1B, the mode signal is made of the multiple-pulse MP of high impulse TP and predetermined number, and its level changes between th writing power P w, erase power Pe and substrate bias power Pb.
In addition, the cycle of the mode signal (recording pulse signal) shown in Figure 1B is by the following cycle A to F that is divided into.
(cycle A): the cycle between the rising of the rising of tracer signal and high impulse TP
(cycle B): the cycle of high impulse TP
(cycle C): the cycle between the high impulse TP and the first multiple-pulse MP
(cycle D): the cycle of multiple-pulse MP
(cycle E): the cycle of calming down pulse CP
(cycle F): calm down the pulse CP cycle afterwards
With reference to figure 7, at first, the variable Ts of preceding spacing and the variable Tm of record mark length are replaced with 3T (step S1).Just, at first be created in high-frequency signal information D 33 among Fig. 5.
Next, be that Ts and record mark length are in the situation of Tm (after this, this condition is represented as " (Ts-Tm) ") in preceding spacing, mode data (value of each part in the mode signal) are read (step S2) from the mode table.In the situation of the multiple-pulse type mode shown in Fig. 8 A, the mode data comprise high-pulse widths Ttop, multiple-pulse width Tmp, the mobile width Tld of the rising edge of high impulse, the mobile width Ttr of the negative edge of high impulse, bias level Pb, and Writing power level Pw.In addition, in the situation of the multiple-pulse type mode shown in Fig. 8 B, these mode data further comprise calms down pulse width T cl and wipes level Pe.
Next, based on the mode data of obtaining with this method, determine the frequency (step S3) of the high-frequency signal in each the cycle A to F shown in Figure 1B.Specifically,, determine that the phase place of the frequency of high-frequency signal so that mode signal and high-frequency signal is consistent each other for each cycle A to F, that is, mode signal and high-frequency signal in the rising of each pulse of constituted mode signal and descend regularly locate synchronized with each other.Whereby, the drive pulse waveform that drives LD in the rising and the falling portion office of each pulse of mode signal becomes identical all the time, and becomes and can form identical record mark consistently.Yet, in this case, require the frequency of high-frequency signal only in the scope that can obtain the original squelch influence that produces owing to the overlapped high-frequency signal, to change.Specifically, the change of frequency is limited in the preset range that the fundamental frequency of high-frequency signal definite each information-recording apparatus begins.
Next, for each cycle A to F of mode signal, determine the suitable amplitude (step S4) of high-frequency signal corresponding to the power level in the cycle (Pw, Pe and Pb).The high-frequency signal data of determining with this method are stored in (step S5) in the high-frequency signal table 170.
As mentioned above, when obtaining the high-frequency signal data that (3T-3T) locate, record mark length T m has been increased 1T (step S6), and whether definite record mark length T m becomes 6T (step S7).(step S6: not), then process does not turn back to step S2 when record mark length T m becomes 6T.Like this, by repeating step S2 to S6 till record mark length T m becomes 6T, with respect to preceding spacing 3T, record mark length is that 3T, 4T and the high-frequency signal data that are equal to, or greater than 5T are produced, and these data are stored in the high-frequency signal table 170.
When in step S7, when record mark length T m becomes 6T, preceding spacing Ts is increased 1T, and record mark length T m turns back to 3T, and process turns back to step S2.Use this method, with respect to current spacing Ts be 3T, 4T and when being equal to, or greater than 5T and when record mark length T m be 3T, 4T and nine situations when being equal to, or greater than 5T, by repeating this process till preceding spacing Ts becomes 6T, as shown in Figure 5, high-frequency data is produced and is stored in the high-frequency signal table.
In above-mentioned example, in step S4,, determine the amplitude of high-frequency signal according to the power level among each cycle A to F.Yet by only changing the frequency of the high-frequency signal among each cycle A to F, this amplitude can be identical in cycle A to F.
In addition, in above-mentioned example, in step S3, determine the frequency of high-frequency signal, so that the phase place of mode signal and high-frequency signal is consistent each other.Yet,, can determine that the frequency of high-frequency signal so that the phase place of two signals have constant phase relation not allowing under the consistent each other situation of the phase place of two signals.Just, in the consistent each other situation of the phase place that makes mode signal and high-frequency signal, the phase place of high-frequency signal also becomes 0 degree when the phase place of mode signal is 0 degree, and when the phase place of mode signal was 180 degree, the phase place of high-frequency signal became 180 degree.On the other hand, can determine that the frequency of high-frequency signal so that the phase place of two signals have constant phase relation, for example make that the phase place of high-frequency signal is 180 degree of the phase place back of mode signal all the time.In this case, as long as the phase place of two signals keeps constant phase relation, the rising of each segment pulse in the mode signal and the waveform of decline place are exactly identical.Therefore, can form identical shaped record mark in all-the-time stable ground.
[second embodiment of record control unit]
Next, with reference to second embodiment of Fig. 9 declare record control assembly.Fig. 9 illustrates the structure according to the record controls parts 10c of second embodiment.It should be noted, to first embodiment shown in Fig. 4 in the identical parts of record controls parts 10b, given identical Reference numeral.
Although in the record controls parts 10b of first embodiment, the mode signal is as analogue signal generating, and in the record controls parts 10c of second embodiment, this mode signal produces as numerical data.Here it is and the difference of first embodiment.
Figure 10 illustrates the example of a Waveform Control table 122.This is the example in the situation of mainly utilizing above-mentioned multiple-pulse type mode, and has stored Wave data (numerical data) D (D10 to D120 in this example) that the level that constitutes high impulse and multipulse each pulse is shown for each pulse width and each recording power.As shown in Figure 11 B, numerical data D is made of one group of N bit digital level value, and described N bit digital level value forms the pulse with certain pulses width.It should be noted that Figure 11 B represents the numerical data D corresponding to the pulse with 1T pulse width shown in Figure 11 A, wherein regulate the level of rising and sloping portion by the influence of considering overshoot (overshooting) He Xiachong (undershooting).For example, pulse width is that 1.00T and recording power are that the Wave data D100 of 10mW is the group data that constitute the N bit digital level value of this pulse.
Mode data production part 121 based on tracer signal with reference to mode table 110, and the information of obtain manner signal (for example, high-pulse widths, multiple-pulse width, and high impulse and multipulse power level).Based on the information of the mode signal that obtains, the 121 reference waveform control tables 122 of mode data production part, and obtain corresponding to high impulse and multipulse numerical data, come the producing method data, it is a digital signal.
Now, be similar to the waveform shown in Figure 11 C, suppose according to tracer signal to have formed the 6T record mark, stipulate that then the recording power of high impulse TP and multiple-pulse MP is Pw=10mW.If corresponding to the mode signal of 6T record mark is to be that the high impulse TP of 1T and multiple-pulse MP that two pulse widths are 0.50T constitute by a pulse width, then mode data production part 121 is with reference to the Waveform Control table 122 shown in Figure 10, and obtains the Wave data D100 that is used for a described high impulse and be used for described two multipulse Wave data D50.Then, mode data production part 121 offers totalizer 141 with the combination of those Wave datas as mode data S20.
On the other hand, identical with first embodiment, high-frequency data production part 160 based on record data with reference to high-frequency signal table 170, and phase place is consistent with the mode signal with sloping portion or offer totalizer 141 with high-frequency data S21 that the mode signal has a frequency of constant phase relationship in the rising of mode signal.Therefore, totalizer 141 will produce recording impulse data S24 from the mode data S20 of mode data production part 121 with from the high-frequency data S21 addition of high-frequency data production part 160, and described data are offered digital-to-analog converter 142.
Digital-to-analog converter 142 is electric current output types, and according to predetermined clock digital recording pulse data S24 is converted to simulating signal, and drives LD150.Use this method, the LD150 emission is corresponding to the recording laser of described tracer signal.
Use this method, though when the mode signal be when producing as digital signal, high-frequency signal also can suitably be produced.In above-mentioned example, as shown in Figure 9, after described mode data and high-frequency data are each other as the numerical data addition, carry out digital-analog conversion.Yet, in those data by after D/A converts simulating signal to individually, the described simulating signal addition each other of obtaining thus.
As mentioned above, information-recording apparatus is included as the LD of information record emission recording laser, generation is corresponding to the recording pulse signal production part of the recording pulse signal of the tracer signal of input, produce the high-frequency signal production part of digital high-frequency signal based on tracer signal, by recording pulse signal and high-frequency signal are added the totalizer that produces drive pulse signal together, and by driving the driver part that LD launches record light based on drive pulse signal.Whereby, frequency and stack amount that can hard-core setting high-frequency signal.Therefore, become and to produce best high-frequency signal corresponding to the power of recording pulse signal.Because the phase place of high-frequency signal can be adjusted to recording pulse signal, so can stop the harmful effect of high-frequency signal to the rising and falling edges of recording pulse signal.In addition owing to can easily obtain better jitter value by those control, so can improve information-recording apparatus high-speed record aspect system's boundary.
Claims (13)
1. an information-recording apparatus (1) comprising:
Light source (15), its emission are used for the record light of information record;
Recording pulse signal production part (12,120,121), its produce corresponding to the recording pulse signal of the tracer signal (Sr) of input (S10, S20)
High-frequency signal production part (16,160), its based on tracer signal produce digital high-frequency signal (S11, S21);
Totalizer (14,141), it is produced drive pulse signal (I with recording pulse signal mutually with high-frequency signal
LD); And
Driver part (2), it is based on the drive pulse signal driving light source, with emission record light.
2. information-recording apparatus as claimed in claim 1 (1), the rising part of each pulse that wherein said high-frequency signal comprises in described recording pulse signal and falling portion office have the constant phase relation with recording pulse signal.
3. information-recording apparatus as claimed in claim 2 (1), wherein the frequency of the high-frequency signal in each recurrence interval is determined to be in the rising part of each pulse that comprises in the described recording pulse signal and falling portion office and has constant phase relation with recording pulse signal.
4. information-recording apparatus as claimed in claim 2 (1), wherein the rising part of each pulse of comprising in described recording pulse signal of the phase place of high-frequency signal is consistent with the phase place of recording pulse signal with the falling portion office.
5. information-recording apparatus as claimed in claim 2 (1), wherein the rising part of each pulse of comprising in described recording pulse signal of the phase place of high-frequency signal and falling portion office are than the phase place of recording pulse signal in advance or fall behind constant angle.
6. information-recording apparatus as claimed in claim 1 (1), wherein said high-frequency signal production part are each recurrence interval that comprises in the described recording pulse signal to determine that the amplitude of high-frequency signal is best for the recording power level in each recurrence interval.
7. information-recording apparatus as claimed in claim 1 (1) wherein has different amplitudes in each recurrence interval that high-frequency signal comprises in described recording pulse signal.
8. information-recording apparatus as claimed in claim 1 (1), wherein said high-frequency signal production part comprises:
High-frequency signal table (170), its storage comprise the high-frequency signal data corresponding to the preset frequency of record mark length and amplitude;
Parts (160), it is based on the record mark length that comprises in tracer signal of input, obtains frequency and amplitude corresponding to the high-frequency signal of each record mark with reference to the high-frequency signal table;
And
Parts (160), its generation have the frequency obtained and the digital high-frequency signal of amplitude.
9. information-recording apparatus as claimed in claim 1 (1), wherein said high-frequency signal production part comprises:
High-frequency signal table (170), its storage comprise corresponding to the preset frequency of the spacing before record mark length and the record mark and the high-frequency signal data of amplitude;
Parts (160), its based on the described record mark length that comprises in tracer signal of input and described before spacing, obtain frequency and amplitude with reference to the high-frequency signal table corresponding to the high-frequency signal of each record mark;
And,
Parts (160), its generation have the frequency obtained and the digital high-frequency signal of amplitude.
10. information-recording apparatus as claimed in claim 1,
Wherein said high-frequency signal production part comprises digital-to-analog converter (142), and it is converted to analog high frequency with digital high-frequency signal, and
Described totalizer is with recording pulse signal and analog high frequency addition, to produce the analog-driven pulse signal.
11. information-recording apparatus as claimed in claim 1 (1), wherein said recording pulse signal production part produces a digital recording pulse signal, and described totalizer comprises:
Parts (141), it produces the digit drive pulse signal by with digital recording pulse signal and digital high-frequency signal addition, and
Digital-to-analog converter (142), it is the analog-driven pulse signal with the digit drive pulse conversion of signals.
12. information-recording apparatus as claimed in claim 1 (1),
Wherein, the recording pulse signal production part produces the digital recording pulse signal and comprises a digital-to-analog converter (142), and this digital-to-analog converter is converted to the analog record pulse signal with the digital recording pulse signal,
The high-frequency signal production part comprises a digital-to-analog converter, and this digital-to-analog converter is converted to analog high frequency with digital high-frequency signal, and
Totalizer is with analog record pulse signal and analog high frequency addition, to produce the analog-driven pulse signal.
13. an information recording method comprises:
The recording pulse signal production process, its tracer signal corresponding to input produces recording pulse signal;
The high-frequency signal production process, it produces digital high-frequency signal based on tracer signal;
Additive process, it is by producing drive pulse signal (I with recording pulse signal (S10) and high-frequency signal (S12) addition
LD); And
The driving process, it is used for the record light of information record based on drive pulse signal driving light source (15,150) with emission.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP115357/2003 | 2003-04-21 | ||
| JP2003115357A JP4197452B2 (en) | 2003-04-21 | 2003-04-21 | Information recording apparatus and information recording method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1540635A true CN1540635A (en) | 2004-10-27 |
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ID=32959573
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2004100369421A Pending CN1540635A (en) | 2003-04-21 | 2004-04-21 | Information recorder and information recording methods |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US7336589B2 (en) |
| EP (1) | EP1471512A3 (en) |
| JP (1) | JP4197452B2 (en) |
| CN (1) | CN1540635A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007317343A (en) * | 2006-04-28 | 2007-12-06 | Sharp Corp | Recording parameter setting device, program thereof, computer-readable recording medium containing the program, information recording medium, and recording parameter setting method |
| US7701989B2 (en) * | 2006-06-05 | 2010-04-20 | Panasonic Corporation | Laser diode driving apparatus |
| KR100800881B1 (en) | 2006-08-11 | 2008-02-04 | 삼성전자주식회사 | Method and apparatus for supporting qos in residential ethernet system |
| US20100080095A1 (en) * | 2008-10-01 | 2010-04-01 | Panasonic Corporation | Recording control method, recording/reproduction method, recording control apparatus and recording/reproduction apparatus |
| US8289829B2 (en) * | 2008-10-01 | 2012-10-16 | Panasonic Corporation | Information recording medium and recording/reproduction apparatus |
| MX2010005823A (en) * | 2008-10-01 | 2010-06-21 | Panasonic Corp | Information recording medium and recording/reproducing device. |
| JP2011134407A (en) * | 2009-12-25 | 2011-07-07 | Hitachi-Lg Data Storage Inc | Optical disc device and disc identification method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6421314B1 (en) * | 1998-09-10 | 2002-07-16 | Sony Corporation | Semiconductor laser drive device, optical head, optical disk device and optical disk recording and reproducing method |
| JP2000149302A (en) | 1998-09-10 | 2000-05-30 | Sony Corp | Semiconductor laser driving device, optical head, optical disk device and optical disk recording and reproducing method |
| US6269060B1 (en) | 1999-09-09 | 2001-07-31 | Ian E. Harvey | Programmable write signal generator |
| JP2002230813A (en) | 2001-01-31 | 2002-08-16 | Sony Corp | Semiconductor laser driving device |
| JP3834485B2 (en) | 2001-05-28 | 2006-10-18 | 株式会社日立製作所 | LASER DRIVE DEVICE, OPTICAL DISK DEVICE USING SAME, AND LASER CONTROL METHOD THEREOF |
| JP3740413B2 (en) * | 2001-12-20 | 2006-02-01 | 株式会社日立製作所 | High frequency superimposing method and optical disk apparatus using the same |
-
2003
- 2003-04-21 JP JP2003115357A patent/JP4197452B2/en not_active Expired - Fee Related
-
2004
- 2004-04-20 US US10/827,518 patent/US7336589B2/en not_active Expired - Fee Related
- 2004-04-21 CN CNA2004100369421A patent/CN1540635A/en active Pending
- 2004-04-21 EP EP04009428A patent/EP1471512A3/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004319054A (en) | 2004-11-11 |
| EP1471512A3 (en) | 2007-06-13 |
| US20050030871A1 (en) | 2005-02-10 |
| US7336589B2 (en) | 2008-02-26 |
| JP4197452B2 (en) | 2008-12-17 |
| EP1471512A2 (en) | 2004-10-27 |
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